fix: remove 10 unused variables and imports across 4 navigation files

- Homepage.tsx: remove unused username state variable
- AppView.tsx: remove 3 unused Lucide icon imports
- TopNavbar.tsx: remove 4 unused Accordion component imports
- LeftSidebar.tsx: remove 2 unused variables (err, jwt)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/ui/Desktop/Navigation/AppView.tsx

@@ -10,12 +10,7 @@ import {
 } from "@/components/ui/resizable.tsx";
 import * as ResizablePrimitive from "react-resizable-panels";
 import { useSidebar } from "@/components/ui/sidebar.tsx";
-import {
-  LucideRefreshCcw,
-  LucideRefreshCw,
-  RefreshCcw,
-  RefreshCcwDot,
-} from "lucide-react";
+import { RefreshCcw } from "lucide-react";
 import { Button } from "@/components/ui/button.tsx";
 
 interface TabData {